I've now been able to play 2 games of Eclipse, and I can tell it definitely feels like Master of Orion! This game, which is currently #12 on lists of boardgamegeek, is not a board game for everyone, but for those who like it it's really excellent! It may be a bit too heavy to be casual fun game, especially because of it's setup time - but it's still really lightweight to be a game it represents. There are plentys of reviews of the game if you google for such, so I'll mention about the game basics only briefly.